Graphic paper



oct. 19, 1937.-

Reissued Oct. 19, 1937 v Re. 20,534

UNITED STATES PATENT OFFICE .Max HeinricnGlieAiliiI-? Germany, sa?

signor to Firm- Graf und Co., Verpackungs- Maschinen, Berlin, Germany Original No. 1,917,032, dated July 4, 1933, Serial No. 549,866, July 10,1931, and in- Germany July 12, 1930. Application for reissue January 20, 1934, Serial No. 707,616

1i claims.

' This invention relates to graphic paper, this term being used in a. broad sense to indicate paper of the type commonly referred to as photographic paper on which drawings and images are produced or reproduced photographically, and paper of the class commonly referred to as drawing paper on which drawings are made byA draftsmen and artists in pencil and ink and the like. 'I'he invention relates more particularly to -photographic paper such as is used for making kblue prints or similar photographic reproductions, and to drawing paper of the kind customarily used for making construction or shop drawings. 'I'he object of the invention is to provide such graphic papers with a backing of metal foil arranged in a novel forni to permit its use regardless of the dimensions of the paper, and to reduce the possibility of puncturing the ypaper to a minimumwhen making pencil or ink tracings therefrom. Other more specific objects will appear from the description hereinafter and the features of noveltywill be pointed out in the claims.

In the accompanying drawing, which illustrates an example of the invention without defining its limits, Fig. 1 is a cross-sectional view of the novel graphic paper in one form; Fig. 2 is a face view thereof with parts broken away, and Fig. 3 is a longitudinal section through Fig. 2.

The graphic paper, in the form illustrated, consists of an outer sheet c, a backing of metalfoil a-b secured to the one surface of said sheet c, and an outer sheet d fastened to the rear surface of said backing of metal foil a-b, as shown in Fig. 1. When constructed in the indicated manner the sheet c constitutes photographic paper of the type exemplified -by the Customary blue print paper or the like, while the backing of meta1.foil a-b is constructed of aluminum; in such casethe outer sheet d constitutes a protective layer or sheet which serves to protect the aluminum` foil backing d b against decomposition if the photographic print is developed by means of an acid or salt. If this protection is not required the protecting sheet d may be omitted, in which case, the graphic paper will simply consist of the sheet c of photographic paper and the backingl of metal foil a-b. 'I'he latter may be applied to the Vsheets c and d by a process of hard rolling and in some forms the sheet d"may be secured to said metal backing -b by means of a suitable paste. v

In some forms of the graphic paper the outer sheet d may be a'sheet of drawing paper to one surface of which lthe backing of metal foil a-b may be fastened in any convenient manner as by pasting. In suchcase the sheet c may be omitted or included as part of the graphic paper in a form other than photographic paper. If the sheet d constitutes a sheet ofdrawing paper, drawings may be made thereon in -any customary (Cl. 95-8) r manner by means of pencil and drawing ink and erasures may be made thereon inthe usual way.

tions of metalA foil and to reduce the danger of `injury when the paper is folded and the. possibility of puncturing the paper'in the making of tracings therefrom, the sections of metalfoil `w---b have their contiguous edges in engagement with each other along a line other than a line continuously straight throughout the length of said contiguous edges. In the illustratedform shown in Fig. 2 of the drawing, the abutting edges of the' sections a and b are of undulating conformation or more specifically of wave-shaped or dovetail form as shown in f; in other words, the aforesaid contiguous edges of the sections .a and b lie in engagement with each other along a line extending alternately to opposite sides of a median line throughoutthe length'of said edges, it being understood that the specific conformation of the line along which the sections a and b 'engage each other in Fig. 2 may be varied in, any way within the scope of the aforesaid terminology. More particularly said wave-shaped edges f may be in the form of sine-curves of any desired amplitude, that is to say, said edges are not necessarily of the specific serpentine shape shown in the drawing. When using ed'ges f of the form of a sine or similar curve, 'the curve may also be more flattened or more pointed than as shown. The arrangement of metal backing as illustrated and described has the greatA advantage that it permits the backing to be applied eillciently to graphic paper of any dimensions, by placing a plurality of metal sheets or layers, which individually have a limited width, side by Aside with their wave-shaped edges f or their equivalent abutting; this also makes it possible to make drawing templets for work pieces oi any desired size.

'Ihe undulating, wave-shape or equivalent edges f also reduce to a minimum the danger of perforating the paper when making a drawing thereon or a tracing therefrom and at the same along a straight line.

Having the abutting edges oi' the two backing sheets a and b engaging each other along edges such as indicated at j or their equivalent, which edges abut each other, provides the further advvantage that the surface of the paper will be plane and'even, in contradistincton to arrangements in which the sheets exemplified by the sheets a and b overlap each other and thereby form ridges at the overlapping portions. It is quite evident that the lines ofea drawing produced or reproduced on the novel graphic paper will intersect the edges of the sections a and b which abut each other along wave-shaped or equivalent lines, only at single points, while in` the case of straight abutting edges or overlapping edges, the lines of such drawing will intersect the abutting line of the two sheets along a greater or even the entire length of the line of junction; in the latter instances if lines of the drawing happen to coincide or register with such straightA line of junction, the pencil or other instrument used in making such lines might easily perforate the paper and result in injurying or tearing not only the paper sheet, but also the metal foil backing a-b.

The novel effect and the advantages which may be attained with the present invention may be clearly seen from Fig. 2 in which g designates a drawing of an angle-iron with holes, it being understood that this illustration is merely an example; the single points at which the lines of the drawing of this angle-iron g intersect the wave-shaped or equivalent line along which the adjacent edges of the sections a and b of the metal foil engage each .other are indicated at h, )L2-hz, h3, and h4. It will be noted that the angles of intersection between the lines of the drawing g and the lines f along which the sections a and b engage each other are all approximately right angles with the result that during the process of copying, the drawing cannot be distorted by warping or the like.

As previously stated herein, the term graphic is used in a broad sense to indicate not only the production of drawings by lines and the like, but also the reproduction of images and their equivalent photographically.

AVarious changes in thespeciflc forms shown an'd described may be made within the scope of the claims without departing from the spirit of the invention.

I claim:

1. As an article of manufacture, a sheet of graphic paper, and a backing of metal foil secured to one surface of said sheet of paper, said backing consisting of a plurality of adjacent sections having their contiguous edges in engagement with each other along a line extending alternately to opposite sidesof a median line throughout the length of said contiguous edges.

2. As an article of manufacture, a sheet of drawing paper, and a backing of metal foil secured to one surface of said sheet of paper, said backing consisting` of a plurality of adjacent sections having their contiguous edges in engagement with each other along a line extending alternately to opposite sides of a median line throughout the length of said contiguous edges.

3. As an'article of manufacture, a sheet of drawing paper, and a backing of metal foil secured to one surface of said sheet of paper, said backing consisting of a plurality of adjacent sections having their contiguous edges in engagement with each other along an undulating line throughout the length of said contiguous edges.

4. As an article oftmanufacture', a sheet of. photographic paper, and a backing of metal foilA secured to one surface of said sheet of paper, said backing consisting of a plurality of adjacent sections having their contiguous edges in engagement with each other along a line extending alternately to opposite sides of a median line throughout the length of said contiguous edges.

5. As an article of manufacture, a sheet of Iphotographic paper, and a .backing of metal foil secured to one surfaceof said sheet of paper, said backing consisting of a plurality of adjacent sections having their contiguous edges in engagement with each other along an undulating line throughout the length of said contiguous edges.

6. As an article of manufacture, a sheet of opaque photographic paper, a backing of metal foil permanently secured to the rear surface of said sheet of photographic paper throughout its area, and a protective layer fastened to the rear surface of said backing of metal foil.

'1. As an article of manufacture, a sheet of photographic paper, a backing of metal foil se-l cured to the rear surface of said sheet of photographic paper, said backing of metal foil consisting of a pliu'ality of sections having their contiguous edges in engagement 'with each other along a line extending alternately to opposite sides of .a median line throughout the length of said contiguous edges, and a protective layer fastened to the rear surface of said backing of metal foil.

8. As an article of manufacture, a sheet of photographic paper, a backing of metal foil se- I cured to the rear surface of said sheet of photographic paper, said backing of metal foil conprinting paper, especially for making copies of drawings, said paper consisting of a light-sensitive sheet, a metal foil backing fastened to the rear surface of "said light sensitive sheet, said metal foil backing beingv composed of' several pieces placed side by side and abutting with each other alongwave-shaped edges, and a sheet of paper fastened to the rear surface of said metal foil backing.

10.' As an article of manufacture, a sheet of opaque photographic paper, a backing of metal foil permanently secured to the rear surface of said sheet of photographic paper throughout its area, said backing of metal foil consisting of a plurality of sections having their contiguous edges in engagement with each other throughout the length of said contiguous edges along a line pro-- 'protective sheet of paper permanently secured to the rear' surface of said backingf'of metal foil throughout its area to form a three layer paper which remains at regardless of temperature or moisture conditions, said sheetpfopaque'graphic f paperbeing light sensitized.

MAX I-IAEDIRICH. 

